Air conditioning unit



H. R. HARDING AIR CONDITIONING UNIT June 20, 1939.

Filed June 15, 1957 i I I l 2 Sheets-Sheet 1 June 20, 1939. H. R. HARDING AIR CONDITIONING UNIT ZSheets-Sheet 2 Filed June 15, 1937 Patented June 20, 1939 UNITED STATES PATENT OFFICE Application June 15,

2 Claims.

This invention relates to an improvement in air-conditioning units, and has for its object to provide a portable air-conditioning unit that is simple in construction and effective in operation, and which can be placed in any desired position in a room or office, and in which CO2, in the form of dry ice, is employed as a cooling means, the operation of the unit being automatically controlled by the use of a thermostat.

The invention consists of the novel'construction and arrangement of the parts and combination of parts-hereinafter more fully set forth in the following specification and pointed out in detail in the appended claims.

In the accompanying drawings:

Figure 1 is a vertical longitudinal section on the line I--l of Figure 2, the lower portion of the dry ice chamber being broken away.

Figure 2 is a vertical longitudinal section on the line 2-2 of Figure 1.

Figure 3 is a perspective view of the unit embodying my invention.

Referring to the accompanying drawings, forming part of this specification, and in which like reference numerals designate like parts throughout the several views thereof, l designates the outer casing which is provided with a door 2 in the front thereof, an air inlet 3 in one side thereof, and a cold air outlet 4 in the top 30 thereof, the location of the inlet and outlet in any other part of the casing l is optional. Witha in the casing I is a chamber 5 in which the dry ice is contained, and is placed therein through the door 6 in the front thereof in line with the door 2 in the casing l. Surrounding the chamber 5 on the sides and bottom is a passage I communicating with the inlet'3 and outlet 4 and having blades 8 extending outwardly from opposite sides of said passage 1 around which extends the corrugated finning 9. The said chamber 5 is surrounded by the insulation [0, which may be of any suitable insulating material, and which holds the cold caused by the evaporation of the ice and causes it to penetrate into the passage against the blades 8 and finning 9, causing the air passing through the said passage 1 to be cooled before passing through the outlet 4 into the room. The air is drawn through the inlet 3 and through the passage 1 and forced out at the outlet 4 and by means of the fan III, which is operated by the electric motor ll, through the medium of the shaft l2. The pressure of the gas in the chamber 5 is controlled by the valve H! which is connected to a pressure gauge l4 and has a pipe l5 leading from the chamber 5 to the valve I3. The said valve I3 is set to operate at a predetermined pressure and open the valve and allow the gas to escape through the pipe IE to 1937, Serial No. 148,311

the condensation pipe ll where it is carried off with the water of condensation, thus maintaining a predetermined pressure in the chamber 5 when the unit is in operation. The chamber 5 also has a pipe l8 leading therefrom to the pipe ii and is provided with a valve I9 controlled by a solenoid 20. This valve I9 is always open when the unit is not in operation and allows the gas caused by the evaporation-of the dry ice to escape from the chamber 5 and pass 01f with the water of condensation, but when the current is turned on to operate the unit, the solenoid closes the valve l9 and allows the gas to build up in the chamber 5 and the amount of pressure therein will be controlled by the pressure valve I3.

Within the passage 1 is a bulb 24 connected bywires with the thermostat 2| which in turn is connected by wires 22 to the defrosting heater 23 in the passage 1 near the inlet 3. When the temperature in the passage 7 drops below a predetermined degree, the thermostat 2| operates to turn on the current to the defrosting heater 23 and operates to cut off the current when the temperature rises above said predetermined degree in the passage I. The water of condensation passes off through the pipe l1.

Having thus described my invention, what I claim is:

1. An air-conditioning unit comprising a chamber adapted to receive a block of dry ice, an air passage surrounding said chamber and having an inlet and an outlet, a fan to draw the air through said air passage and discharge it through said outlet, a pipe communicating with the said air chamber to carry on the water of condensation, a pipe leading from the said chamber to the said water pipe, a valve in said pipe leading from said chamber to control the gas pressure therein, a second pipe leading from said chamber to the said condensation pipe, and means to open and close communication therebetween.

2. An air-conditioning unit comprising a cabinet having a door therein, a dry ice chamber within said cabinet having a door in line with the door in said cabinet, an air passage surrounding said chamber and having an inlet and an outlet, 2. fan to draw the air through said air passage and discharge it through said outlet, a pipe communicating with the said air chamber to carry off the water of condensation, a pipe leading from said chamber to the said water pipe, a valve in said pipe leading from said chamber to control the gas pressure therein, a second pipe leading from said chamber to the said condensation pipe, and means to open and close communication therebetween.

HIRAM R. HARDING. 

